33.3 Remake Status

PEK Parts as of: Jun 1996

PekAu

This is my FFT test program. It takes audio input from one of the Mac's audio input source (i.e. not a file) and does a near realtime FFT on the samples. It then displays the input data in several formats depending on user menu selections. It can plot the input samples and the FFT power spectrum spikes. I made a primative attempt at showing a "bird's eye view" of our City of Keys grid by using a grid of rectangles that change size based on FFT values. I also added a Piano keyboard display that shows FFT values, it does track the audio samples very well; it does however provide a bit of fun as a primitive synthesizer keyboard.

Status

• Need to extract the FFT routines from this experiment and add them to the PlayOld code experiment.
• Would be nice to try other FFT routines... someday.
• it does _NOT_ track the audio samples very well;

PlayOld

My test program to help remember how to read the original digital sample tape the was made at the Speach and Hearing Lab.

Status

• Need to check to see if we have a 32K sample rate limit problem
• Need to add FFT code.

MkAuQt

This is a set of QT interface procedures and a test program that add audio support to our movie making tools. The test program generates a QuickTime Movie with a video and an audio track. The audio test samples, a beep, are generated on the fly ; in our remake we will use the original digital samples.

API

The following new QT audio interface routines were designed to slide into my QT movie part of your VanLib:

movieSetupAudio(Fixed sampleRate)

Initialize QT movie audio track.

movieFrameAddAudio(Handle sndHandle, UInt16 sampleCnt)

Add audio samples to our QuickTime movie.

I think that we can just replace the old qt module with qtAu.c since it includes the previous QT video procedures:

movieOpenX(ImgX imgX, char * movieName, char * ioFlag)

Open a QuickTime movie.

movieClose(void)

Close current QuickTime movie.

movieFrameAddX(ImgX imgX)

Add a frame to the current movie

Status

• Can not have a TimeScale value above 32K (i.e. high order bit of a 16-bit number is set)
• Appending to the end of previous movie does not work yet, the file grows but a QT player can not find the new frames
• last frame of movie may be duplicated (?)
• my Mac died, can not justify getting a new one
• the Mac Mini is cheap enuf that I might be willing to get one.